List of top Physics Questions asked in MHT CET

In meter-bridge experiment a resistance of \(18\,\Omega\) is connected in left gap and unknown resistance \(R\) is connected in right gap. The null point is obtained at \(\ell_1\) from left end. If unknown resistance is replaced by \(\left(\frac{R}{3}\right)\Omega\), the null point is obtained at \(1.5\ell_1\). The unknown resistance is

For athermanous substances, coefficient of transmission is

A motorcyclist rides in a horizontal circle about a central vertical axis inside a cylindrical chamber of radius \(r\). If the coefficient of friction between the tyres and the inner surface of the chamber is \(\mu\), the minimum speed of motorcyclist to prevent him from skidding is (\(g\) = acceleration due to gravity)

For a gas \(\dfrac{R}{C_v} = 0.67\). This gas is made up of molecules which are

If a p–n junction diode is reverse biased then

The resultant of two vectors \(\vec{P}\) and \(\vec{Q}\) is \(\vec{R}\). When the direction of \(\vec{Q}\) is reversed, the resultant is given by \(\vec{S}\). Which one of the following is true for vectors \(\vec{R}\) and \(\vec{S}\)?

The variation of stopping potential for metals A, B, C and D with frequency of incident radiation is as shown in the figure. For which metal, stopping potential is higher for lower values of threshold frequency (\(\nu_0\))? [The frequency of incident radiation \(\nu\) is same.]

A prism having refractive index \(\sqrt{2}\) and refracting angle \(30^\circ\) has one of the refracting surfaces silvered. The beam of light incident on the other refracting surface will retrace its path, if angle of incidence is \([\sin(\pi/6)=0.5]\)

The threshold wavelengths for photoelectric emission from two metals A and B are 400 nm and 800 nm respectively. The ratio of their work functions \(\phi_A\) to \(\phi_B\) is

A lift of mass \(m\) is ascending with an acceleration \(a\) (\(a<g\)). The tension in the cable of the lift is ( \(g\) = acceleration due to gravity )

A bar magnet is held perpendicular to a uniform magnetic field. The couple acting on the magnet is to be halved by rotating it. Through what angle should it be rotated? \([\sin(\pi/2)=1]\)

A long metal rod of length \(L\) completes the circuit as shown. The area of the circuit is perpendicular to magnetic field \(B\). Total resistance of the circuit is \(R\). The force needed to move the rod in the direction as shown with constant speed \(V\) is

A water film is formed between two straight parallel wires, each of length \(10\,\text{cm}\), kept at a separation of \(0.5\,\text{cm}\). Now, the separation between them is increased by \(1\,\text{mm}\) without breaking the water film. The work done for this is (surface tension of water \(= 7.2 \times 10^{-2}\,\text{N m}^{-1}\))

A potentiometer wire of length 100 cm and resistance \(3\,\Omega\) is connected in series with resistance of \(8\,\Omega\) and an accumulator of 4 volt whose internal resistance is \(1\,\Omega\). A cell of e.m.f. \(E\) is balanced at 50 cm length of the wire. The e.m.f. of the cell is

A sphere of gold when brought towards a powerful magnet experiences

An electron in the ground state of hydrogen atom is revolving in a circular orbit of radius \(R\). The orbital magnetic moment of the electron is (\(m\) = mass of electron, \(h\) = Planck’s constant, \(e\) = electronic charge)

In single slit diffraction experiment, when the distance of separation between the slit and screen is doubled, the angular separation between fringes

Moving coil galvanometers \(M_1\) and \(M_2\) have resistance, number of turns, area of coil and magnetic field as follows: \(R_1 = 10\Omega,\; R_2 = 14\Omega,\; N_1 = 30,\; N_2 = 42,\) \(A_1 = 3.6 \times 10^{-3}\,\text{m}^2,\; A_2 = 1.8 \times 10^{-2}\,\text{m}^2,\; B_1 = 0.25\,\text{T},\; B_2 = 0.50\,\text{T}\). (Spring constants are same for both materials.) The ratio of (i) current sensitivity and (ii) voltage sensitivity for galvanometer \(M_2\) to \(M_1\) is respectively

The magnetic moment produced in a substance of mass 5 g is \(6 \times 10^{-7} \, \text{A m}^2\). If its density is \(5 \, \text{g cm}^{-3}\), then intensity of magnetization in \(\text{A m}^{-1}\) will be

Two progressive waves are travelling towards each other with velocity \(50 \, \text{m s}^{-1}\) and frequency \(200 \, \text{Hz}\). The distance between two consecutive antinodes is

The equation of simple harmonic wave is given as \(y = 5 \sin\frac{\pi}{2}(100t - x)\), where \(x\) and \(y\) are in metre and time in second. The period of the wave is

A coin is placed on a horizontal plate. The plate performs S.H.M. vertically with angular frequency \(\omega\). The amplitude \(A\) of oscillations is gradually increased. The coin will lose contact with the plate for the first time when amplitude is ( \(g\) = acceleration due to gravity )

A body is moving along the circumference of a circle of radius \(r\) with uniform speed \(v\), then the radial acceleration of the body is

The percentage errors in measurements of mass and speed of a body are 2% and 3% respectively. What is the percentage error in kinetic energy of the body?